At 03.58 2005.08.26 -0500, you wrote:
>When using  DC-DC power supply for a PIC-based project, what is considered 
>acceptable (or good, or excellent) ripple voltage?  I am using National's 
>Webench to create a DC-DC converter and can get the ripple to a simulated 
>13mV with components that I can get at DK/Mouser.  I'm curious how good this 
>is.  I assume that the answer will vary/depend on whether I'm using the A/D 
>module, which I am.

I guess, just guess, that (given a 4.096V reference for the ADC) / 0.013, i.e.
about 1/315, will be ok up to 8 bit of resolution but not more. The advice
I would give you is to use an even worse PS if you want, but to filter very
well the ADC voltage reference, to make sure there's no injected noise.

Surely 13mV ain't going to be a problem for the digital part.. probably neither
if it was ten+ times bigger.

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist